/**
 * @(#) AddDigit.java Mar 8, 2010 10:43:40 AM
 * Copyright (C) 2009 GeeYee Inc. 60606, Chicago, IL, USA
 * All right reserved
 */
package number;;

/**
 * Class <code>AddDigit</code>
 * 
 * @author Xiaowen dingxwsimon@gmail.com
 * @since Mar 8, 2010 10:43:40 AM
 * 
 */
public class AddDigit
{

	public static int add_digit(int k)
	{
		while (k > 9)
		{
			k = k / 10 + k % 10;
		}

		return k;

	}

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		// TODO Auto-generated method stub
		System.out.println(AddDigit.add_digit(1234579));
	}

}
